Grainsmith

Forty thousand cells, eleven materials, one rule each. Paint something and let go of it. Sand piles, water pools, oil floats, fire eats the wood and the plants drink whatever is left.

Material

Brush

Size 7

Run

Speed 1×

Scenes

step 0 0 fps 0% of the grid awake drag to paint · right-click erases

Keys: 1–0 pick a material, Space pause, . single step, [ ] brush size, E eraser, C clear. Nothing here is stored or sent anywhere. Water in this world has no pressure, so it will not climb a second column, which is a real property of rules this simple and not a bug.